From ZooTerms (Dictionary of Invertebrate Zoology)
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funnel (noun; Latin infundibulum, funnel): 1. (Annelida: Oligochaeta) Internal opening of both male and female genital ducts

See also: female and male funnel. 2. (Arthropoda: Insecta) See peritrophic membrane. 3. (Mollusca: Cephalopoda) a. A specialized siphon from the mantle cavity providing locomotion by propulsion. b. For Nautiloidea, see hyponome.